Download 1405-D - User Manual

S ECTION 5
MAINTENANCE AND CALIBRATION PROCEDURES
Calibrating the
Ambient Pressure
Perform the ambient air temperature calibration, pressure calibration and
leak check (Section 3) before executing the flow calibration procedure.
To calibrate the ambient pressure:
1. In the TEOM Data screen, select the Service button to display the
Service screen, then select the Calibration button to display the
Verification & Calibration screen (Figure 5-49).
2. Select the Amibent Calibration button to display the Ambient
Calibration screen (Figure 5-54).
Figure 5-54.
Ambient Calibration screen.
3. Determine the current ambient pressure in atmospheres (absolute
pressure, not corrected to sea level).
4. If the measured value is within ± 0.01 atm of the pressure displayed in
the Ambient Pressure: field of the button, no further action is
necessary. Select the < Back button to return to the Calibration
screen. If the value is not within ± 0.01 atm of the pressure displayed
in the Ambient Pressure: field of the button, select the Ambient
Pressure: button. A keypad will display. Enter the actual pressure as
measured by the external device and press the Enter button. The
Ambient Pressure Calibration screen will display with the new entered
value. Select the < Back button to return to the Calibration screen.
THERMO FISHER SCIENTIFIC
OPERATING GUIDE, TEOM 1405-D
5-33